Hello... Only now I've started to 'google' for solutions to my Suprima 80L boiler problems can I see why it's referred to as 'Suprima Hell'...
The boiler was installed in 2005 just before Regulations changed requiring Condensing boilers to be installed. It had the original PCB changed about 2 years ago to the newer Siemens design after a previous failure. That PCB had dry-joints and localised PCB heating evidence which wasn't solved by re-flowing the joints. No problems since until two weeks ago:
A couple of the radiators on the first floor weren't getting very warm, they were bled but there was no air, thermostatic valve fully open, return valve checked ok.
My plumber suggested the pump might be the problem and although dated 1998 I didn't think that was the case, but went along with replacement of newer Grundfoss with higher head/flow rating. He also throttled back the return valves on the two bathroom rads. which act as the by-pass circuit. These radiators stopped getting warm at all, and the boiler just didn't fire up. I opened the return valves some more and the pump sprang into life, indicating to me he'd shut them off too much.
Since then (but not necessarily related!), I've experienced the following:
Boiler demand from thermostat on, controller heating set to 'on 24 hours', red light on and relay clicks on controller, but boiler LED is flashing slowly with a yellow colour (not red, not green) and does not fire-up. No boiler clicking or attempt at ignition.
Pressing reset for short or extended time has no effect. Turning HW off or on has no effect. I have checked the time setting on the controller is correct (and AM when morning!). However, the boiler does spring in to life when you're not expecting it and the radiators and hot water do get hot.
I have changed the controller but that's not the problem. The system is wired as S-plan and is fully pumped with pressurised hot water system.
I'm reluctant to just rush out and buy another controller board due to cost where it might not be the problem.
Anybody else had the same problem and found out the problem?
Thanks in advance
The boiler was installed in 2005 just before Regulations changed requiring Condensing boilers to be installed. It had the original PCB changed about 2 years ago to the newer Siemens design after a previous failure. That PCB had dry-joints and localised PCB heating evidence which wasn't solved by re-flowing the joints. No problems since until two weeks ago:
A couple of the radiators on the first floor weren't getting very warm, they were bled but there was no air, thermostatic valve fully open, return valve checked ok.
My plumber suggested the pump might be the problem and although dated 1998 I didn't think that was the case, but went along with replacement of newer Grundfoss with higher head/flow rating. He also throttled back the return valves on the two bathroom rads. which act as the by-pass circuit. These radiators stopped getting warm at all, and the boiler just didn't fire up. I opened the return valves some more and the pump sprang into life, indicating to me he'd shut them off too much.
Since then (but not necessarily related!), I've experienced the following:
Boiler demand from thermostat on, controller heating set to 'on 24 hours', red light on and relay clicks on controller, but boiler LED is flashing slowly with a yellow colour (not red, not green) and does not fire-up. No boiler clicking or attempt at ignition.
Pressing reset for short or extended time has no effect. Turning HW off or on has no effect. I have checked the time setting on the controller is correct (and AM when morning!). However, the boiler does spring in to life when you're not expecting it and the radiators and hot water do get hot.
I have changed the controller but that's not the problem. The system is wired as S-plan and is fully pumped with pressurised hot water system.
I'm reluctant to just rush out and buy another controller board due to cost where it might not be the problem.
Anybody else had the same problem and found out the problem?
Thanks in advance